Models
Claude Opus 4.5
A version of Anthropic's Claude model used within Claude Code for the initial backdoor experiment.
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- Microsoft finds 'Lazarus' backdoor that turns AI agents against you using tiny neuron changes“In March, researchers began their investigation by having Claude Code, which runs the Claude Opus 4.5 model, attempt to backdoor a model by hardwiring several activations without any training — and it managed to do so.”